ME too , no matter how hard i work on this issue, i can't get rid of staying up late....
i can sleep, i dun have insomnia, i just dun sleep....
my mum , my boss, my fds also tell me i should go to bed early, even myself....
it's like, put a threat to my health as i think i only sleep for about 4-5 hrs a day......
are there any important things i nd to do?? NO............
do i feel sleepy......??YES....
tell u about what i tried before....
set the computer turn off at 12am automatically , but....i turn on again at once...
set the alarm of my cell phone at 12am to remind me, but i just turn it off at once.....
hypnotise myself sleep sleep sleep....., but fail
and i find out there is a more or less helpful way
brush yr teeth , wash yr face and apply any skincare on on yr face normally at around the time u "want" yourself to sleep
after doing this kind of thing, u are ready to sleep
it works a little bit on me